attribute vec3 vPosition;// 顶点坐标
uniform mat4 uMVPMatrix;// 总变换矩阵
attribute vec2  vCoordinate;// 贴图顶点坐标
varying vec2 aCoordinate;// 传给片元着色器的变量
void main(){
    gl_Position = uMVPMatrix*vec4(vPosition, 1);
    aCoordinate = vCoordinate;
}

